# RobozzleReboot vs Modstack

The clearest difference is in-app purchases: RobozzleReboot at none against Modstack's 1. RobozzleReboot also leads on iOS requirement (13.0 vs 15.0). Modstack's advantage is update cadence (every 8 days vs every 4 weeks). On price, ads and device support there is nothing between them.

Both are free to download. Modstack sells 1 one-off in-app purchase. RobozzleReboot asks for nothing beyond the download.

RobozzleReboot ships an update every 4 weeks, Modstack every 8 days. The most recent releases landed on October 3, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | RobozzleReboot | Modstack |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Every 8 days** |
| Monetization | Free | — |
| Size | 21 MB | 30 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Nicolas Widynski](https://appshunter.io/developer/687198503) | [NovoBuild LLC](https://appshunter.io/developer/1784126512) |

## What reviewers say

### RobozzleReboot

[App page](https://appshunter.io/ios/app/robozzlereboot/id6792399726)

Guide a robot through grid-based puzzles by dragging and dropping programming instructions. Collect all stars and reach the goal. Features a campaign, community-created levels, and a puzzle editor.

**Highlights:** Drag-and-drop programming interface, Campaign mode with curated puzzles, Community puzzle catalog, Built-in puzzle editor, Global leaderboard integration, Step-by-step program execution

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### Modstack

[App page](https://appshunter.io/ios/app/modstack-programming-puzzle/id6803866356)

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Full Modstack | $3.99 | one-time |


## Frequently asked questions

### Is RobozzleReboot free?

RobozzleReboot is free to download, with no in-app purchases.

### Is Modstack free?

Modstack is free to download, with in-app purchases available.

### Do RobozzleReboot or Modstack have ads?

Neither RobozzleReboot nor Modstack shows ads.

### Which is updated more often, RobozzleReboot or Modstack?

RobozzleReboot ships an update every 4 weeks, and Modstack every 8 days. Most recently, RobozzleReboot was updated on October 3, 2026 and Modstack on October 10, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*